In transfusion testing, which antibodies influence the selection of antigen-negative RBC units?

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Multiple Choice

In transfusion testing, which antibodies influence the selection of antigen-negative RBC units?

Alloantibodies against non-self red blood cell antigens are the ones that drive the need to provide antigen-negative RBC units. These antibodies develop when a person is exposed to foreign RBC antigens (via prior transfusion or pregnancy) and become specific for those antigens. If transfused RBCs carry the targeted antigen, the antibody can bind and destroy them, risking hemolysis; to prevent this, units lacking that particular antigen are chosen. Autoantibodies against the patient’s own RBC antigens can complicate testing but don’t guide the selection of antigen-negative units in the same antigen-specific way. Antibodies against plasma proteins or against donor leukocytes relate to other immune considerations and are not used to select RBC units based on RBC antigen expression.

Alloantibodies against non-self red blood cell antigens are the ones that drive the need to provide antigen-negative RBC units. These antibodies develop when a person is exposed to foreign RBC antigens (via prior transfusion or pregnancy) and become specific for those antigens. If transfused RBCs carry the targeted antigen, the antibody can bind and destroy them, risking hemolysis; to prevent this, units lacking that particular antigen are chosen. Autoantibodies against the patient’s own RBC antigens can complicate testing but don’t guide the selection of antigen-negative units in the same antigen-specific way. Antibodies against plasma proteins or against donor leukocytes relate to other immune considerations and are not used to select RBC units based on RBC antigen expression.

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